Why should we believe Andrew?
Separately from belief, which is somewhat subjective (i.e. it involves more inputs than is practical to list in a discussion), it's important to realize that on a logical level, there are at least two interpretations to a 99% acceptance rate: (1) the bar is really low and (2) there are pre-filters. The certainty with which I often hear (1) being declared or implied seems to miss this point.